The girls are in business and the better girls will remember good customers, it is good Customer Service and good business sense.
I'm pretty sure that some will, like I do, keep notes about a customer, again, it is good Customer Service and good business sense.
Just last week I walked into a room at the local Chinese shop, the girl turned round, came up to me, gave me a hug and kiss, called me by name and said, "I know what you like!" And she sure got it correct.